RO/DI filter question
- Thread starter Varga
- Start date
There should be a build in restrictor on the waste, what unit is it, how gpd unit, is it new or have you had id fo awhile, most units have a 4-1gal ratio, most ro membranes are rated for 65psi at ro inlet at 70*, so if your house water presure is what you ssay, plus preasure lose in the prefilters and less then 70* you are running more like 8-10-1 rejection rate.
Is this by chance a unit you got on Ebay?? In general, a 100gpd membrane is not the best choice because they are not RO membranes at all but rather a nano filter and will have a lower rejection rate than a standard 50 or 75gpd Dow Filmtec membrane which will give a 96-98% rejection rate. Many of the units sold on Ebay come with some off brand membrane rather than the industry standard for our hobby which are the Filmtecs or the GE DESAL. In any case, your system should produce about a 4-1 ratio of wastewater for every gallon of RO/DI water. It's also normal for the system to continue making waterwater for a little while after you shut off the RO or DI line.
Yes 3gal waste for 1gal ro/di, under the optimal water temp usually rated at 70* and at 65psi going into the ro, not house preasure, which I stated earlier your prefilters drop that preasure. You can get a booster pump, about $100.00 to supply the unit aaat about 80psi. Welcome to the money pit of all hobbies!!!!!!!!! LOL!!!!!!!!!
Varga
Well-Known Member
No kidding :cry1:
should i buy this?
aquatec permeate pump 4 Reverse Osmosis ro water filter - eBay (item 310032131398 end time Mar-24-08 20:01:19 PDT)
will the production go up once the unit breaks in? its been plugged in for maybe 3 hours and i have 2 gallons or pure water, I dunno if it can even produce enough to keep up with my evaporation
<<< yup, from ebay. But alot of folks on here recommended it. >>>
Well like most everything, you get what you pay for, and most of the units on Ebay are cheap for a good reason regardless of what anyone told you.......they typically come with a less efficient off brand membrane, off brand and cheaper pre-filters, and a less efficient and short lived horizontal DI stage.
Do you have a good TDS meter, test your tap and RO and DI TDS. If you plan on using this unit for your tank I would recommend getting a Filmtec membrane and adding a full size DI stage or two (if not already equipped).
Well like most everything, you get what you pay for, and most of the units on Ebay are cheap for a good reason regardless of what anyone told you.......they typically come with a less efficient off brand membrane, off brand and cheaper pre-filters, and a less efficient and short lived horizontal DI stage.
Do you have a good TDS meter, test your tap and RO and DI TDS. If you plan on using this unit for your tank I would recommend getting a Filmtec membrane and adding a full size DI stage or two (if not already equipped).
slakker
Member
Varga
Well-Known Member
First thing all Forums should have stickies "DO NOT BUY ON EBAY"!!!!!!!!! The cost of an RO unit is the membrane!!!!!!! So you got a cheap one!!!!! The good 100gpd RO is 90% and the rest goes to the DI to clean out, shortens the life of the DI, 75gpd or less RO gets 97-98% out the DI only has to deal with that and last longer. Sorry but live and learn as we all have and ask here or Reef Central .com first.
I am saying this in a nice happy way, when readind threads and post look at the sender, there are some that know there stuff, example Chems, Boomer, Provo, Bertroni, Randy Holmes-Farly, RO/Di stuff Boomer, AJ the DerertRat, the rest is opinions and yes, what has worked for them, these guys you can give your first born to!!!!! ANd when you post a thread it is okay to call them out for an answer it or PM it, I know Randy does not answer PM's got too many,
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